Triple Stack container need proper moderation, if it has to run at higher speed. mostly, two units or else 3 units will b needed in order to handle much weight. and running at speed will b a challenge for a triple stack container, and not long it can run above 80 km/h, cause at curves, the entire weight will b compromised.
only normal container freight can easily b handled, but talking for more than double, even a GT90MAC goes under 80 km/h with 3 units, hauling up to 110 double stack.